Effects of Lime with Pig Manure on Fractions of Cd,Pb and Zn in Soil and Phytoavailability

A pot experiment was carried out to investigate the effects of lime with pig manure on the soil Pb,Cd and Zn fractions and plant uptake of these metal elements in the Chinese cabbage.The heavy me-tal fractions in soil were analyzed by using Tessier method.The results showed that with the treatments of lime(L),lime+lower pig manure(LP₁),lime+higher pig manure(LP₂),contents of exchangeable bound to carbonate cadmium,lead and zinc in the soil decreased;contents of Fe-Mn oxide combined and organic matter combined cadmium,lead and zinc in the soil increased.At the same time,contents ofcadmium,lead and zinc in the shoot of Chinese cabbage significantly decreased on the treatments of lime,the obvious treatment which inhibited absorption of Pb,Cd and Zn by plant,is the treatment with 5 g lime for 1 kg soil.In the treatments of lime with pig manure,both of the treatment with 5 g lime and 7.5 g pig manure,and 5 g lime and 15 g pig manure were better than other treatments for 1 kg soil.The results also showed that the effect of lime with lower pig manure is better than the lime with higher pig manure.